---
title: "Molecular weight: research glossary | Sable Peptides"
description: "Molecular weight, more precisely molar mass, is the mass of one mole of a substance, expressed in grams per mole (g/mol). For peptides it is calculated by"
canonical: https://www.sablepeptides.co.uk/glossary/molecular-weight
publisher: Sable Peptides Limited (UK company 17488610)
note: Research use only. Not for human or veterinary use.
---

Glossary

# Molecular weight

Molecular weight, more precisely molar mass, is the mass of one mole of a substance, expressed in grams per mole (g/mol). For peptides it is calculated by summing residue masses plus water and any modifications. It is used to convert between mass and moles when preparing solutions of known molar concentration in the laboratory.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/Molecular_mass)

## Related terms

-   [Residue](/glossary/residue)
-   [Molar mass](/glossary/molar-mass)

[Back to glossary A–Z](/glossary/terms)

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